Update tag 5.6.0 for changeset e7b6e9c4a5d4
There was a small error in the README. The previous tag is fresh and the
announcement was sent yet. So I'm exceptionally overwriting the tag.
all: tutorials/tutorial.rst static/logo-evolve.ico
sphinx-build . ../html/
tutorials/tutorial.rst: tutorials/tutorial.t
python test2rst.py tutorials/
static/logo-evolve.ico: static/logo-evolve.svg
convert -resize 36x36 static/logo-evolve.svg static/logo-evolve.ico